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Alibaba ACA-Operator Exam - Topic 6 Question 55 Discussion

After you enable health checks of Server Load Balancer (SLB), when one backend ECS instance is declared as unhealthy, which of the following statements is correct?
A) Requests are forwarded to other normal ECS instances and the unhealthy ECS instance is shutted down and C) Requests are not forwarded to the ECS instances and you get back a 400 error and D) Requests are not forwarded to the ECS instances and you get back a 500 error
B) Requests are forwarded to other normal ECS instances. When the faulty ECS instance becomes normal, SLB forwards requests to the ECS instance again

Alibaba ACA-Operator Exam - Topic 6 Question 55 Discussion

Actual exam question for Alibaba's ACA-Operator exam
Question #: 55
Topic #: 6
[All ACA-Operator Questions]

After you enable health checks of Server Load Balancer (SLB), when one backend ECS instance is declared as unhealthy, which of the following statements is correct?

Show Suggested Answer Hide Answer
Suggested Answer: A, C, D

by Eladia at Mar 16, 2024, 02:09 PM

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Tawny
10 months ago
C and D are definitely wrong, SLB should reroute requests.
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Stacey
10 months ago
A is misleading, it doesn't shut down the instance right away.
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Lizette
10 months ago
Wait, how can you be sure? What if it just returns an error?
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Josephine
10 months ago
Totally agree, B makes the most sense!
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Chaya
11 months ago
I think B is correct. SLB handles unhealthy instances well.
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Carisa
11 months ago
I’m leaning towards option B as well, but I’m a bit confused about what happens when the unhealthy instance recovers. Does it really start receiving requests again?
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Bernardine
11 months ago
I practiced a similar question, and I feel like option D is wrong because a 500 error usually indicates a server issue, not just an unhealthy instance.
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Annalee
11 months ago
I'm not entirely sure, but I remember something about unhealthy instances being ignored. Maybe it's option A?
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Iesha
11 months ago
I think option B sounds familiar because it mentions that requests go to other normal instances, which is what load balancers usually do.
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Gilma
11 months ago
I've got this! The key is understanding that the unhealthy instance is not shut down, it's just removed from the load balancing rotation. So B is the correct answer - requests are forwarded to other healthy instances, and once the faulty one is healthy again, it'll be added back in.
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Marisha
11 months ago
Okay, let me break this down. If an instance is unhealthy, the SLB won't send traffic to it, so the requests must go somewhere else. B seems like the most logical answer, but I'll double-check the other options just to be sure.
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Miriam
11 months ago
Hmm, I'm a bit confused on this one. I'm not sure if the requests are forwarded to other instances or if there's an error returned. I'll need to think this through carefully.
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Evan
12 months ago
I think the correct answer is B. The question is asking what happens when one backend ECS instance is declared as unhealthy, and B states that requests are forwarded to other normal ECS instances, and when the faulty instance becomes normal again, SLB will forward requests to it.
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Wilford
12 months ago
I think I've got a good handle on this. The key is that the question is asking for a solution that can work within the 172.16.168.0/22 subnet. Based on that, I'm going to go with option A, stateful NAT64.
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Leota
12 months ago
Ah, I remember learning about the search head cluster deployer in class. I'm pretty confident I know the right approach here, so I'll go ahead and select my answer.
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Naomi
12 months ago
Hmm, I'm a bit unsure about this one. I know TCB has something to do with security, but I can't quite remember the exact definition. I'll have to think this through carefully.
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Merissa
1 year ago
Hah, imagine if the system just shut down the unhealthy instance without warning! Talk about a dramatic solution. I'll take B - nice and balanced.
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Brianne
1 year ago
User 3: Definitely, balancing the requests makes more sense.
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Chantell
1 year ago
User 2: I agree, option B seems like a more reasonable approach.
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Amira
1 year ago
User 1: Yeah, that would be quite the surprise!
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Yuki
1 year ago
D has to be the correct answer. A 500 error indicates a server-side issue, which is exactly what I'd expect when an instance is unhealthy.
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Omer
1 year ago
I agree with you, D seems to be the most logical choice. A 500 error makes sense for a server-side issue.
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Theodora
1 year ago
I think B is the correct answer. SLB will forward requests to other normal instances until the faulty one becomes healthy again.
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Laurel
1 year ago
I'm going with C. If an instance is unhealthy, it shouldn't be receiving any traffic at all - a 400 error is the logical response.
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Nina
1 year ago
Option B seems the most reasonable. Forwarding requests to other healthy instances while monitoring the unhealthy one for recovery makes the most sense.
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Lon
1 year ago
Exactly, it's all about maintaining the availability and reliability of the application.
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Freeman
1 year ago
That way there is minimal disruption to the service.
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Evangelina
1 year ago
Yes, it's important to ensure that requests are still being handled while the unhealthy instance is being monitored.
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Shawana
1 year ago
I agree, option B does seem like the most logical choice.
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Dahlia
1 year ago
I'm not sure. I think it might be C. Requests are not forwarded and you get a 400 error.
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Alex
1 year ago
I agree with Werner. SLB forwards requests to other normal ECS instances until the faulty one becomes normal again.
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Werner
1 year ago
I think the answer is B.
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